| Stonyx keenii (Coquillett, 1887) |
| Stonyx lacerus (Wiedemann, 1830) |
| Stonyx lelia Williston, 1901 |
| Stonyx melia Williston, 1901 |
| Stonyx melior (Kertész, 1909) |
| Stymphalina Hull, 1973 |
| Symballa Enderlein, 1926 |
| Systropodini Brauer, 1880 |
| Systropus Wiedemann, 1820 |
| Systropus (Systropus) Wiedemann, 1820 |
| Systropus (Systropus) acutus Painter, R. H., 1963 |
| Systropus (Systropus) arizonicus Banks, 1909 |
| Systropus (Systropus) basilaris Painter, R. H., 1963 |
| Systropus (Systropus) bicornis Painter, R. H., 1963 |
| Systropus (Systropus) dolorosus Williston, 1901 |
| Systropus (Systropus) faenoides Westwood, 1842 |
| Systropus (Systropus) foenoides Painter, R. H. & Painter, E. M., 1963 |
| Systropus (Systropus) funereus Costa, 1864 |
| Systropus (Systropus) lugubris Osten-Sacken, 1887 |
| Systropus (Systropus) nigripes Painter, R. H., 1963 |